I have recently got a Nikon D70s.
I took some test pictures and wanted to view them on my Macbook. I connected the USB to the camera and my Mac. I received an error message on my Mac saying that an external USB device was taking too much power and was closing down the device.
Then the camera connected and briefly allowed me to view some pictures before reverting to the error message.

Since this happened the playback function has stopped working on the camera. It still seems to take pictures but I can't view them.